[Serusers] Recommendations for a fast/flexible B2BUA

Anyone know of a good/fast/flexible B2BUA? I'm looking to do some LCR, Billing (prepaid, postpaid, credit accounts, etc), and just some general call supervision. I see that Vovida's b2bua hasn't seen a fresh release in over 2 years now and I'm wondering if anyone still has this deployed and if it still offers the kind of flexibility that would be required to build an LCR/Billing engine. Does anyone have asterisk deployed as a B2BUA? If so, is it fast and does it provide a decent amount of flexibility? Have you had to throw a session border controller in front of it? Any other recommendations on a B2BUA? Thanks. -Daniel